Toeifu is a defunct Panfu client. It used the old Panfu client and was on the same server as the original Panfu, much like old Pannun and old Panfu.me. It was easy to recognize Toeifu as it had a blue UI. The rooms were also modified, as showed in the picture.
Many people migrated to Toeifu and Pannun when Panfu's chat feature was closed, as you were still able to chat on Toeifu and Pannun.
It may reopen, guessing from tweets written by Badboyyy.